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Table 1 – First Stage Pipe Sizing (Between First and Second Stage Regulators)<br />
10 PSIG Inlet with a 1 PSIG Pressure Drop<br />
Maximum capacity of pipe or tubing, in thousands of BTU/hr or LP-<strong>Gas</strong><br />
20<br />
Size of Pipe Length of Pipe or Tubing, Feet*<br />
or Copper Tubing,<br />
Inches 10 20 30 40 50 60 70 80 90 100<br />
Copper 3/8 558 383 309 265 235 213 196 182 171 161<br />
Tubing 1/2 1387 870 700 599 531 481 443 412 386 365<br />
(O.D.) 5/8 2360 1622 1303 1115 988 896 824 767 719 679<br />
3/4 3993 2475 2205 1887 1672 1515 1394 1297 1217 1149<br />
Pipe Size 1/2 3339 2295 1843 1577 1398 1267 1165 1084 1017 961<br />
3/4 6982 4799 3854 3298 2923 2649 2437 2267 2127 2009<br />
1 13153 9040 7259 6213 5507 4989 4590 4270 4007 3785<br />
1-1/4 27004 18560 14904 12756 11306 10244 9424 8767 8226 7770<br />
1-1/2 40461 27809 22331 19113 16939 15348 14120 13136 12325 11642<br />
2 77924 53556 43008 36809 32623 29559 27194 25299 23737 22422<br />
125 150 175 200 225 250 275 300 350 400<br />
Copper 3/8 142 130 118 111 104 90 89 89 82 76<br />
Tubing 1/2 323 293 269 251 235 222 211 201 185 172<br />
(O.D.) 5/8 601 546 502 467 438 414 393 375 345 321<br />
3/4 1018 923 843 790 740 700 664 634 584 543<br />
Pipe Size 1/2 852 772 710 660 619 585 556 530 488 454<br />
3/4 1780 1613 1484 1381 1296 1224 1162 1109 1020 949<br />
1 3354 3039 2796 2601 2441 2305 2190 2089 1922 1788<br />
1-1/4 6887 6240 5741 5340 5011 4733 4495 4289 3945 3670<br />
1-1/2 10318 9349 8601 8002 7508 7092 6735 6426 5911 5499<br />
2 19871 18005 16564 15410 14459 13658 12971 12375 11385 10591<br />
* Total length of piping from outlet of first stage regulator to inlet of second state regulator (or to inlet of second stage regulator furthest away).<br />
Notes: 1) To allow 2 PSIG pressure drop, multiply total gas demand by .707, and use capacities from table.<br />
2) For different first stage pressures, multiply total gas demand by the following factors, and use capacities from table.<br />
Ex: 1,000,000 BTU load at 5 PSI: 1,000,000 (1.12) = 1,200,000 BTU then use chart bases on 1,200,000 BTU<br />
First Stage Pressure PSIG Multiply By<br />
20 .844<br />
15 .912<br />
5 1.120 Data Calculated per NFPA #54 & 58
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